package com.xywl.escort.utils;

import android.content.Context;
import android.os.Environment;
import android.support.annotation.NonNull;

import java.io.File;
import java.math.BigDecimal;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class DataCleanManager {
    private ThreadFactory nameThreadFactory = new ThreadFactoryBuilder().setNameFormat("").build();
    private ExecutorService singleThreadPool = new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MICROSECONDS, new LinkedBlockingQueue<Runnable>(1024), nameThreadFactory, new ThreadPoolExecutor.AbortPolicy());

    private DataCleanManager() {
    }

    private volatile static DataCleanManager instance;

    public static DataCleanManager getInstance() {
        if (instance == null) {
            synchronized (DataCleanManager.class) {
                if (instance == null) {
                    instance = new DataCleanManager();
                }
            }
        }
        return instance;
    }

    public String getTotalCacheSize(Context context) throws Exception {
        long cacheSize = getFolderSize(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }
        return getFormatSize(cacheSize);
    }


    public void clearAllCache(final Context context) {
        singleThreadPool.execute(new Runnable() {
            @Override
            public void run() {
                deleteDir(context.getCacheDir());
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    deleteDir(context.getExternalCacheDir());
                }
            }
        });

    }

    private boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (String aChildren : children) {
                boolean success = deleteDir(new File(dir, aChildren));
                if (!success) {
                    return false;
                }
            }
        }
        return dir.delete();
    }

    /**
     * 获取文件
     *
     * @param file
     * @return
     * @throws Exception
     */
    public long getFolderSize(File file) throws Exception {
        long size = 0;
        try {
            File[] fileList = file.listFiles();
            for (int i = 0; i < fileList.length; i++) {
                // 如果下面还有文件  
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);
                } else {
                    size = size + fileList[i].length();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    private String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return 0 + "KB";
        }

        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);

        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
    }

    private class ThreadFactoryBuilder implements ThreadFactory {

        private String mNameFormat;

        private ThreadFactoryBuilder() {
        }

        private ThreadFactoryBuilder setNameFormat(String nameFormat) {
            this.mNameFormat = nameFormat;
            return this;
        }

        public ThreadFactoryBuilder build() {
            return this;
        }

        @Override
        public Thread newThread(@NonNull Runnable runnable) {
            return new Thread(runnable, mNameFormat + "-Thread-");
        }
    }
}
